<template>
  <view>
    <view class="search-box">
      <uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
    </view>
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
          <view class="goods-name">{{item.goods_name}}</view>
          <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="clean"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        //延时器
        timer: null,
        //搜索关键词
        kw: '',
        //搜索结果列表数据
        searchResults: [],
        //搜索历史
        historyList: ['a','app','aaple']
      };
    },
    onLoad() {
        this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]') 
    },
    methods:{
      //输入事件
        input(e){
          clearTimeout(this.timer)
          this.timer = setTimeout(()=>{
            this.kw = e.valueOf()
            this.getSearchList()
          },500)
        },
        async getSearchList(){
          if(this.kw.length === 0){
            this.searchResults = []
            return
          }
          const {data: res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query: this.kw })
          if(res.meta.status !== 200) return uni.$showMsg()
          this.searchResults = res.message
          
          this.saveSearchHistory()
        },
        gotoDetail(item){
          uni.navigateTo({
            url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id 
          })
        },
        saveSearchHistory(){
          // this.historyList.push(this.kw)
          const set = new Set(this.historyList)
          set.delete(this.kw)
          set.add(this.kw)
          this.historyList = Array.from(set)
          //将数据持久存储
          uni.setStorageSync('kw',JSON.stringify(this.historyList))
        },
        clean(){
          this.historyList = []
          uni.setStorageSync('kw','[]')
        },
        gotoGoodsList(kw){
          uni.navigateTo({
            url: '/subpkg/goods_list/goods_list?query='+kw
          })
        }
    },
    computed:{
      histories() {
        return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
  
.search-box{
  position: sticky;
  top: 0;
  z-index: 999;
}

.sugg-list{
  padding: 0 5px;
  .sugg-item{
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    .goods-name{
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
  }
}

.history-box{
  padding: 0 5px;
  .history-title{
    display: flex;
    justify-content: space-between;
    height: 40px;
    align-items: center;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }
  .history-list{
    display: flex;
    flex-wrap: wrap;
    .uni-tag{
      margin-top: 5px;
      margin-right: 5px;
    }
  }
}
</style>
